Gce Model Questions Vol1 2021 Agricultural Science Question 12

Practice objective / multiple choice question 12 from the 2021 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2021 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 12 GCE_MODEL_QUESTIONS_VOL1 • 2021 • AGRICULTURAL_SCIENCE • objective

The yield response of a crop to nitrogen fertilizer (kg ha\(^{-1}\)) is given by \(Y = 2N - 0.01N^{2}\) (tonnes ha\(^{-1}\)). (i) Find the range of nitrogen rates \(N\) that will give a yield between 12 t ha\(^{-1}\) and 15 t ha\(^{-1}\) inclusive. (ii) Using the lower feasible nitrogen rate, calculate the total amount of nitrogen fertilizer required for a 25 ha field (round to the nearest kilogram).

Answer Options

A. N between 6.0-8.0 kg ha⁻¹ (or 185.0-200.0 kg ha⁻¹); total fertilizer ≈145 kg
B. N between 5.5-8.2 kg ha⁻¹ (or 180.0-210.0 kg ha⁻¹); total fertilizer ≈140 kg
C. N between 6.3-7.5 kg ha⁻¹ (or 190.0-192.5 kg ha⁻¹); total fertilizer ≈160 kg
Correct Answer D. N between 6.1-7.8 kg ha⁻¹ (or 192.2-193.9 kg ha⁻¹); total fertilizer ≈152 kg
Correct Answer
D
Correct Option:
N between 6.1-7.8 kg ha⁻¹ (or 192.2-193.9 kg ha⁻¹); total fertilizer ≈152 kg

About This Question

This is Gce Model Questions Vol1 2021 Agricultural Science Question 12. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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